10. Space Studies Board, 1990 Update to Strategy for the Exploration of the Inner Planets , National Academy Press, Washington, D.C., 1990.

11. Space Studies Board, Strategy for Exploration of the Inner Planets: 1977-1987, National Academy Press, Washington, D.C., 1978.

12. Space Studies Board, 1990 Update to Strategy for the Exploration of the Inner Planets, National Academy Press, Washington, D.C., 1990, Chapter 5 and Chapter 6.

13. Space Studies Board, The Search for Life's Origins: Progress and Future Directions in Planetary Biology and Chemical Evolution, National Academy Press, Washington, D.C., 1990.

14. Astronomy and Astrophysics Survey Committee, The Decade of Discovery in As tronomy and Astrophysics, National Academy Press, Washington, D.C., 1991.

15. Space Studies Board, Assessment of Programs in Solar and Space Physics 1991, National Academy Press, Washington, D.C., 1991.

16. European Space Agency, Mission to the Moon: Europe's Priorities for the Scientific Exploration and Utilization of the Moon, Report of the Lunar Study Steering Group, ESA SP-1150, European Space Agency, Noordwijk, The Netherlands, June 1992.

17. Space Studies Board, Assessment of Programs in Space Biology and Medicine 1991, National Academy Press, Washington, D.C., 1991.

18. Space Studies Board, Assessment of Programs in Space Biology and Medicine 1991, National Academy Press, Washington, D.C., 1991, Chapter 4.

19. See, for example, Nancy Ann Budden and Paul D. Spudis, “SEI Science: Measuring the Return,” Aerospace America, March 1993, page 22.



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